IIA Institutional Repository

Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

Sort by: Order: Results:

  • Correlation between optical and γ-ray flux variations in BL Lacs 
    Rajput, Bhoomika; Shah, Zahir; Stalin, C. S; Sahayanathan, S; Rakshit, S (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)
    We report here results of the analysis of correlated flux variations between the optical and GeV γ-ray bands in three bright BL Lac objects, namely AO 0235+164, OJ 287, and PKS 2155−304. This was based on the analysis of ...
  • Correlation between optical flux and polarization variations in flat-spectrum radio quasars on diverse time-scales 
    Pandey, Ashwani; Bhoomika, R; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Study of the polarization behaviour in blazars is a powerful tool to discern the role of the magnetic field in the variable emission process in their relativistic jets. We present here the results of our systematic ...
  • Correlation between sunspot number and Ca II K emission index 
    Bertello, L; Pevtsov, A; Tlatov, A; Singh, J (Springer, 2016-11)
    Long-term synoptic observations in the resonance line of Ca II K constitute a fundamental database for a variety of retrospective analyses of the state of the solar magnetism. Synoptic Ca II K observations began in late ...
  • Correlation between Supergranular Lane Widths and Sunspot Number; A Simple Way to Predict the Amplitude of Sunspot Cycle 
    Raju, K. P; Singh, Jagdev; Ravindra, B; Priyal, M (American Astronomical Society, 2023-12-20)
    The network structure seen in the solar images is the outline of supergranulation, which is the large-scale convection in the Sun with a size of about 30 Mm and a lifetime of 24 hr. We have obtained the supergranulation lane ...
  • The Correlation Lifetimes of Chromospheric CA II K Network Cells 
    Raju, K. P; Srikanth, R; Singh, J (Springer, 1998-03)
    The lifetimes and spatial scales of emission network cells in the solar chromosphere were studied from a nearly continuous sequence of Caii K filtergrams, obtained from Antarctica. The temporal autocorrelation function ...
  • Correlation Trends in the Ground-State Static Electric Dipole Polarizabilities of Closed-Shell Atoms and Ions 
    Singh, Y; Sahoo, B. K; Das, B. P (American Physical Society, 2013-12-03)
    We employ the closed-shell perturbed relativistic coupled-cluster (RCC) theory developed by us earlier [Phys. Rev. A 77, 062516 (2008)] to evaluate the ground-state static electric dipole polarizabilities (αs) of several ...
  • Correlation trends in the hyperfine structures of 210, 212Fr 
    Sahoo, B. K; Nandy, D. K; Das, B. P; Sakemi, Y (The American Physical Society, 2015-04)
    We demonstrate the importance of electron correlation effects in the hyperfine structure constants of many low-lying states in 210Fr and 212Fr. This is achieved by calculating the magnetic dipole and electric quadrupole ...
  • Correlations between the CME acceleration, other CME parameters and flare energy 
    Suryanarayana, G. S (Elsevier B.V., 2019-04)
    While the Coronal Mass Ejections (CMEs) without associated flares are known to accelerate and decelerate being moderated by the Lorentz force, gravity and the drag force due to solar wind, the flare association is known ...
  • Correlations of Faint Galaxies: A Monte Carlo Approach 
    Chokshi, A (The American Astronomical Society, 1998-03)
    Monte Carlo methods are employed to study the angular correlations arising from simulated galaxy clusters in flux-limited samples. In particular, we show that the models of Chokshi and coworkers that best reproduce the ...
  • A Correlative Study of Green Coronal Intensity with Other Solar Indices 
    Ramesh, K. B (Springer, 1998-01)
    Lomnicky Stit data of 5303 U coronal green-line index (CI) are analysed for the years 1965–1994. The yearly quiet-Sun component (Q_ci) of CI estimated through the linear regression analysis of CI with sunspot numbers (SS) ...
  • Cosmic background temperature and the coupling constants of fundamental interactions 
    Sivaram, C (Kluwer Academic Publishers, 1993-08)
    The underlying links between the coupling constants of the fundamental interactions and cosmological parameters explored earlier is shown to give rise to a definite value for the cosmic background temperature.
  • Cosmic ether 
    Tomaschitz, R (Springer, 1998-03)
    A prerelativistic approach to particle dynamics is explored in an expanding Robertson-Walker cosmology. The receding galactic background provides a distinguished frame of reference and a unique cosmic time. In this context ...
  • Cosmic evolution of AGN using self-consistent black hole energetics 
    Mangalam, A (Astronomical Society of India, 2015)
    We consider a model that takes into account the mass and spin accreted by the hole and the angular momentum torque due to an electrodynamical jet. The spin evolution is calculated with and without accretion; if the accretion ...
  • Cosmic ray constraints on neutron-antineutron and hydrogen-antihydrogen oscillation time scales 
    Sivaram, C (INSDOC, 1983-08)
    Recently some modifications of the usual GUTS models have been proposed where global baryon-lepton symmetry is spontaneously broken, leading to neutron-antineutron and hydrogen-antihydrogen oscillations. The possible ...
  • Cosmic ray electron acceleration in the remnant of nova GK Persei? 
    Kantharia, N. G; Anupama, G. C; Subramanian, P (Tata Institute of Fundamental Research, 2005)
    Radio observations of the nova remnant of GK Per around 1985 (epoch 1) have shown it to have a spectral index of -0.4 (S propto nu^alpha) at frequencies <1.4 GHz and a spectral index of -0.7 at frequencies >1.4 GHz (Seaquist ...
  • The Cosmic Ray Flare of March 7, 1942 
    Sivaraman, K. R; Punetha, L. M (Kodaikanal Observatory, 1966-11)
    The variation of the dynamic characteristics of the cosmic ray limb flare of March 7, 1942 based on the K/sub232/ spectroheliograms and H-alpha spectrohelioscope observations of Kodaikanal is presented. Although the flare ...
  • Cosmic rays from cosmic strings and other topological defects 
    Bhattacharjee, P (World Scientific, 1995)
    The model of origin of ultrahigh energy (UHE) (i.e., energy E~> 10sup/8 eV) cosmic rays from cosmic topological defects such as cosmic strings, magnetic monopoles, etc., is discussed. We discuss the general nature of the ...
  • Cosmic relics from the microsecond epoch 
    Bhattacharjee, P (Saha Institute of Nuclear Physics, 1995)
    "A phase transition from quark-gluon plasma to hadronic matter may have ocurred in the early universe when the universe was about 10 ~sec old and the temperature was about 100-200 MeV. Is there any relic from that microsecond ...
  • Cosmic separation of phases, density inhomogeneities and primordial nucleosynthesis 
    Rana, N. C; Datta, B; Raha, S; Sinha, B (Elsevier, 1990-04)
    The authors investigate the role of the cosmic QCD phase transition on the relative abundances of light elements in primordial nucleosynthesis, with particular attention on the so-called 7Li over-production problem.
  • Cosmic Spin and Mass Evolution of Black Holes and Its Impact 
    Bhattacharyya, Dipanweeta; Mangalam, A (IOP Publishing, 2020-06-01)
    We build an evolution model of the central black hole that depends on the processes of gas accretion, the capture of stars, mergers, and electromagnetic torque. In the case of gas accretion in the presence of cooling ...

Search DSpace


Browse

My Account